The composition of stony meteorites (VII) the special significance of eucrites Stannern and Nuevo Laredo in lunar-meteorite comparative studies

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Several refractory elements (Sc, Sr, Ba, Ti, Y and rare earths, U and Zr) which are strongly enriched in the lunar surface, are enriched in eucrites Nuevo Laredo and Stannern relative to other eucrites and the howardites. Th appears to be an exception. The degrees to which these elements enrich, between average eucrite and eucrites Stannern and Nueavo Laredo, vary considerably. For Sc and Sr, the degree of enrichment is small (˜5-10%) whereas other elements (Zr, Ti, Ba and particularly the rare earths, for example) are more strongly enriched (˜25-100%).Nuevo Laredo and Stannern appear to contain either similar or equivalent amounts of the refractory elements considered here.

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